Like a kid shooting spitballs, designer Beer Holthuis has figured out that sopping wet paper is the best material for making mischief. His 3D printer, a primitive RepRap clone that literally squirts out huge lines of paper pulp, is designed to allow artists and designers to create more sustainable 3D objects.

According to 3DPrint.com, Holthuis was searching for material that wouldn’t create waste or increase plastic pollution. He settled on ground up paper. By extruding the wet paper he is able to create a thick bead of pulp that he can then build up to create decorative objects.

“The design of the printed objects are using the possibilities and beauty of this technique,” said Holthuis. “The tactile experience, bold lines and print speed results in distinctive shapes. The objects are also durable: Printed paper is surprisingly strong.”

The interesting thing is that he uses natural binder to stick the layers together, ensuring that the entire system is recyclable. You could even feed paper into the machine and let it product the pulp automatically, thereby creating a self-feeding recycling system. Best of all, however, the objects look like something a super intelligent wasp colony would produce to trade with other cultures. Fascinating stuff.